389728517 has 2 divisors, whose sum is σ = 389728518. Its totient is φ = 389728516.

The previous prime is 389728501. The next prime is 389728523. The reversal of 389728517 is 715827983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371487076 + 18241441 = 19274^2 + 4271^2 .

It is a cyclic number.

It is not a de Polignac number, because 389728517 - 2⁴ = 389728501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389728117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194864258 + 194864259.

It is an arithmetic number, because the mean of its divisors is an integer number (194864259).

Almost surely, 2^389728517 is an apocalyptic number.

It is an amenable number.

389728517 is a deficient number, since it is larger than the sum of its proper divisors (1).

389728517 is an equidigital number, since it uses as much as digits as its factorization.

389728517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 50.

The square root of 389728517 is about 19741.5429234900. The cubic root of 389728517 is about 730.4447886715. Note that the first 3 decimals are identical.

The spelling of 389728517 in words is "three hundred eighty-nine million, seven hundred twenty-eight thousand, five hundred seventeen".